Slipform blade and method for applying pre-compression strain to cast-in-place concrete on well walls

A slipform blade foot having an annular structure, for applying prestressing strain to cast-in-place concrete of a shaft wall, comprising a plurality of blade foot block structures connected end to end, wherein each blade foot block structure comprises:

• a blade foot block body, comprising:
• a lower plate (2);
• an outer plate (3), vertically arranged at a first end of the lower plate (2);
• a blade foot block connecting plate (5), wherein a first end of the connecting plate (5) is connected to a second end of the lower plate (2);
• an upper plate (4), wherein a first end of the upper plate (5) is connected to a second end of the connecting plate (5), and wherein the upper plate (4) comprises a hole groove;
• an arc plate (1), wherein one end of the arc plate (1) slidably engages the outer plate (3) via a lower edge structure, and a second end of the arc plate (1) overlaps with the upper plate (4);
• a vertical displacement generating device (6), disposed between the lower plate (2) and the arc plate (1), wherein:
• a fixed end of the device (6) is fixedly connected to the lower plate (2);
• a telescopic end of the device (6) is fixedly connected to the arc plate (1);
• the device (6) is configured to drive the vertical displacement of the arc plate (1);
• a displacement sensor (7) arranged on the telescopic end of the vertical displacement generating device (6), which configured to monitor the vertical displacement in real time;
• a limit plate (8) having an I-shaped structure with two horizontal surfaces and one vertical surface, wherein:
• a first horizontal surface of the limit plate (8) is fixedly connected to the arc plate (1);
• the vertical surface passes through the hole groove of the upper plate (4) and is slidably connected to the hole groove;
• a second horizontal surface is located below the upper plate (4), and wherein both of the horizontal surfaces are larger than the hole groove.